What is a moon watch? What's the use of the moon phase table?

Moon phase watch is a personalized watch with the function of displaying the moon phase. Through the moon phase dial on the watch, you can grasp the changes of the moon. The moon phase function is usually set in a specially shaped semi-circular window on the dial.

The moon phase shows the state of the moon on the moon phase disk according to the cycle of 29.5 days. There are two moons on this lunar disk with 59 teeth on the edge. After the moon phase wheel is pushed by the driving wheel, it advances one tooth every day, and the change of the moon phase profit and loss will be displayed on the dial in time.

The 59-tooth moon phase wheel comes from the average value of the moon phase profit and loss every 29.5 days. Because the precise rotation period of the moon is 28 days 12 hours, 44 minutes and 2.9 seconds, the error of the moon phase display will reach 24 hours every 33 months. There is usually a button on the watch case to adjust the moon phase, and the moon phase display is relatively independent from the functions such as timing and perpetual calendar.

Extended data

As early as a few years ago, the Athens Watch was famous for its "astronomical trilogy" of eclipses and moon coordinates. In 2009, Athens' brand-new astronomical watch named after Moonstruck's moon fantasy marked its progress in lunar phase technology.

Moonstruck's design concept focuses on the celestial system among the sun, the earth and the moon, and scientifically describes the moon phase ups and downs and the tidal changes caused by the gravity between the moon and the sun and the earth in the form of clocks and watches.

In Moonstruck's movement, two moon phases are combined into one, which can simulate the alternate changes of new moon and full moon. At the same time, the imaginary trajectory of the earth's rotation around the sun is presented in another turntable in the form of rotation every 24 hours. The global tidal phenomenon caused by the gravity of the moon and the sun can also be displayed completely and accurately in the moon watch.

Baidu Encyclopedia-Moon Phase Table